1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7dfba098e5a59d8a972f8380f2c68d77f2a260be9fda5cdbe07b07ec948e55. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bc34d53-e5b5-42a1-8264-7db63563fe6a.json and https://artists.proofprofile.net/proofs/artist/0bc34d53-e5b5-42a1-8264-7db63563fe6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8add9ad3edb8ea87f6f3c5b62c8ca355e179df52f7f2f867618021b7799257. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKACT1940643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7680b8196ecf56b78b32dc35ce56286eba650fab3ee4d0fa0f4aa7454ae759aa. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEU2042405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda756d1454650c7d022e2a130c3f91d2ac23871a2b191c693756b66120edd1a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKR6V2011462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f3ace00c46937cc1217a92bcf879121c4d985323d282d09aaf679646dc065b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKR6V2080094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12d1057e871ba0872dacbab3773cd4ef1bbc6fb13359bdab9744d31a47ae4c2. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNJW2232560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35bcb3c538aa9025c8e045ebe8483a42a8b9beafcb07e33c053f2d1e60fb2da. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNJW2222738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e7e6c1e2562c7c9f96f1963ff2d8c7a79bec737ea74e6a3ccd563a397039ea. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2592523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193f8cbacf53e744bfe693808b71d2fa09c57dc90af160c41f8ee02347154540. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2568697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7270a652cb8e7cdaba6c08fc636f8d1e77d483122189c5bdb4313a1ddeb7be7c. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2558185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904a3be400d20b606e59c896a4057f65b3855ed50f6d1bb614657f9f4dea7a51. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2527195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x034de9eedda712ee8b7b2e08d1e87ff19790fee1e088bf2ccc881da3310f4f1f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2533741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904a3be400d20b606e59c896a4057f65b3855ed50f6d1bb614657f9f4dea7a51. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTLA2527195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6f61366e80a0522e6ea583bea8563e290453238b245d65d3fc849692c2b6b2. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA42239035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83fc03c382cdaab724f34f9ccaddf6aff40f738fcf5bafc5b3c201e82b6c6f8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6H2138382.